IV2 - IV. Anatomy of a Reflex A. Structures Involved 1....

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IV. Anatomy of a Reflex A. Structures Involved 1. dorsal (posterior,sensory) root a. all afferent (sensory) fibers from periphery 2. dorsal (sensory) root ganglion a. contains sensory nerve cell bodies (bipolar) 3. ventral (anterior,motor) root a. motor nerve AXONS only i. skeletal motor neurons (ant. horn) ii. smooth/cardiac/gland neurons (lat. horn) B. The Simple Reflex Arc 1. A special type of conduction pathway 2. Receptor - responds to internal/external stimulus 3. Sensory Neuron - passes impulse to CNS a. impulse sent along nerve from that organ b. eventually reaches DORSAL ramus of spinal nerve c. synapses on neuron somewhere in grey matter 4. Center - point in the CNS where message is accepted a. sometimes directly to the effector motor neuron b. most times on an INTERNEURON of dorsal horn c. passes message to motor neuron in VENTRAL HORN d. or passes message to brain via specific tract 5. Motor neuron - sends signal to appropriate effector a. resides in anterior horn - skeletal muscle
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IV2 - IV. Anatomy of a Reflex A. Structures Involved 1....

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